In high-volume production, it is the price of the end product that matters. Purchasing decisions for production equipment therefore usually boil down to price divided by output modified by some efficiency factor.
However, the number of good products that are really produced is determined by the machine design, line layout, number of machine stoppages and board quality. That is what determines whether you have made the correct purchasing decision. Since unbuffered lines are less efficient than buffered ones, buffering needs to be considered when the line is purchased.
SMTA - Surface Mount Technology Association is a non-profit international association of companies and individuals (totalling 4,000) involved in all aspects of advanced electronics assembly, surface mount and related technologies. Membership Info | SMTA Certification | Bookstore
IPC - Association Connecting Electronics Industries is a US-based trade association dedicated to the competitive excellence and financial success of its nearly 2,600 member companies which represent all facets of the electronic interconnection industry, including design, printed wiring board manufacturing and electronics assembly. Membership Info | Training & Certification Programs | Standards & Publications - Online Store